4. Boring or penetrating the earth
  5. With means to feed drive
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Directional drilling apparatus

Boring or penetrating the earth – With means to feed drive
Patent

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Drilling device and drilling method utilizing dual drives

Boring or penetrating the earth – With means to feed drive
Reexamination Certificate

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Drilling machine having a feed cable tensioner

Boring or penetrating the earth – With means to feed drive
Reexamination Certificate

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Drilling machine having a movable rod handling device and a...

Boring or penetrating the earth – With means to feed drive
Reexamination Certificate

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Drilling machine having a movable rod handling device and a...

Boring or penetrating the earth – With means to feed drive
Reexamination Certificate

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Drilling machine having a rotary head guide

Boring or penetrating the earth – With means to feed drive
Reexamination Certificate

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Drive mechanism for boring machine

Boring or penetrating the earth – With means to feed drive
Reexamination Certificate

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